Thermodynamic micellization model of asphaltene precipitation from petroleum fluids
- Reservoir Engineering Research Inst., Palo Alto, CA (United States)
A thermodynamic micellization model is proposed for the description of asphaltene precipitation from petroleum fluids. It describes the solubilization of asphaltene polar species by resin bipolar molecules in the micelles. A simple form of the standard Gibbs free energy of micellization is used. The petroleum fluid is assumed to be a dilute solution with respect to the monomeric asphaltenes, resins, and micelles. The Peng-Robinson equation of state (PR-EOS) is applied to describe the fugacity of monomeric asphaltene in the bulk of the petroleum fluid. Intermicellar interactions as well as osmotic pressure effects are neglected. The proposed model shows promising results to describe asphaltene deposition from crude mixtures. It predicts the change in precipitation power of different alkane precipitants and the effect of pressure on asphaltene precipitation. The amount and the onset of predicted asphaltene precipitation are sensitive to the amount of resins in the crude. All these results are in line with laboratory observations and oil-field data.
- OSTI ID:
- 256879
- Journal Information:
- AIChE Journal, Journal Name: AIChE Journal Journal Issue: 6 Vol. 42; ISSN AICEAC; ISSN 0001-1541
- Country of Publication:
- United States
- Language:
- English
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